Gear-cutting machine.



GEAR CUTTING MACHINE.

APPLIOATION FILED SEPT. 16, 1908.

Patented 001;. 26, 1909.

2 SHEETS-SHEET 1.

T. C. DILL.

GEAR CUTTING MACHINE.

APPLICATION FILED SEPT.16,1908.

Patented 0011.26, 1909.

{SHEETS-SHEET 2.

, sa T my o'rnfn :2 he i il .4, A. n M.

GEillfiCU'ITING MACHINE.

npplicasion filed September 1s, 13%. Serial Ho. 253,5296.

To all whom it may concern: 1

Be it known that l, Tnoims C. DELL, n eilizen ol' the United States,residing in Philadelphia, Pennsylvania, have imrenled.

forms of slotters whereby these latter may be rendered available for usein cult-in gear teeth, etc, it being especially desired that the deviceshall be relatively inexpensive 8.5 well es uncomplicated andsubrtentiel.

T e objects and other advantageous ends I secure as hereinafter setforth, reference being had to the accompanying drawings, in which Figurel, is i. side elevation of the nutchine constructed according to myinvention:-Fig. 2, is side elevation on an enlarg'ed scale, illustratingcertain of the de tail features of the tool-carrying heed Fig. 3, is avertical section oi the cutting l'ool employed in connection with myinvention, and illustrating it as an-acting wi'lh a master gear in orderthat it shall properly operate upon blank to be cut; Fig, 4-, is a plan,

partly in horizon'nl section, taken on the line +l:*i, Fig. 3; Fig. 5,is n perspective view of the tool post; Fig. 6, is :1 perspcelive viewof the cum structure employed as phrt of my invention; Fig: 7, avertical section on the line 7-7, Fig. 4, and Figs. 8 and f) arerespectively a side elevation pnrlly in section, and n fragmentary planilluslruting 1 modified form oi my invention.

In the nhove drawings A represents the base or main slrucllure oi 21slolter which is conslruclion Patent No. 776,501, dated December 6,i904.

preferably though not necessarily oi. the

described and claimed in my This pm'licular machine is provided with ahorizontally adjustable head B upon which is mounted the reciprocubletool-carrying ram C, while in addition said base is pro vid cd with 2.work simportiug lZllJlG D which is not only horizoncnlly ndjustnhle intwo directions at right angles to each other huh also rotatable aboutn-verticn'l axis.

1 have not illustrated the detail mechanisms for operating the rain orthe work supporting table, inasmuch as these are well ltuownio the artand in tliemselves iorni no part of my present invenlion.

in the present instance the ram C, as shown inl igs. 1 and 2, hasrigidly held to it by means oi clnn'ips c a. vertically mounted toolpost E, which is tubule. and enlarged at its lower end; it being splitor' vertically slotted at c as shown in l igs. 3 and 5. Forther, it isprovided with a plane portion 0 which is designed to fit against theflat face of the rain C so the; when it finally clamped in position itcan by no possibilityhzive any turning movement. Extending through thispost is a tool spindle l! en-- htrged at the lower end and havingconnected to it by a nut f :1 cutting tool f made to have the generaloutline of a gear and provided with teeth of such number and dimensionas may be required by the work to.

be performed Said spindle is held to the post by ncnns of :1 nut or nuts1 Eli. its no per end, and while tlree to i'urn in the tool p'osl, ninybe clamped by means of e bolt 7 so as to be rigidly connected thereto.This hitteextends through the enlarged lower end 0" of the tool post,and I provide means whereby the slotted portions oi lhe lower end ofthis post may be drawn together to grip the s niulle l to prevent itfrom turnlug. For this purpose ll employ in the presenl; instance acollar G mounted upon the bolt f and having in its face adjacent to theface of the end e n series of holes r concenll'lc with said boll-f. v

The outer face of the collar G is provided with n plurality of coins gand there is mounted upon the bolt 7'" an arm ll having on its hub anumber of Inojocliions 7L dc lflil0l to co-act with the inclined coinfeces y on the collar G. As shown in l" ig. 4-, the

bolt 7" has a head between which and the enlarged end e of the tool postthe hub of the arm H and the collar G are confined, and is moreoverprovided at its opposite end with 21 pair of nuts 7" whereby it may beheld in any adjusted position to the tool post. The arm H is of such itlength that it is capable of engagement with estructure K mounted uponthe stationary portion of heed B of the slotter. This structure, shownin 7, is provided with a longitudinally movable latch bolt is normallyheld outward by a spring is to a distance determined by a pin 70 The endof said latch bolt 70 is par- 5 tially cut away and is curved to co-actwith the curved end k of the arm H so that when said arm is movedupwardly, its curved end strikes the similarly curved end of the latchbolt is and causes this to move longitudinally without being itselfcaused to turn on the '20 or'disk L in which it is desired to cut gearteeth, or other forms, while immediately above and concentric with it Imount a master gear M. The ram of the slotter is now caused to bevertically reciprocated by the operation of the well known mechanism andthe work table D is fed toward the cutting tool f; the stroke of the rambeing so adjusted that the said tool at the upper end 01' its strokemeshes with the teeth of the master gear, and at the lowerend thereofpauses below the blank operated on. The tool therefore begins a cut inthe blank immediately under and in line with a space between twoadjacent teeth of the master gear. I next start the mechanism forrotating the work table so that this latter is given a fraction of aturn while the tool is in engagement with the teeth of the master gear,and in order that said tool may be free to turn when the master gear isthus turned, and yet may be rigidly held while making a cutin the blank,I so adjust the bolt f and its co-acting parts 6 Grand H- that when thearm H is in the position shown in Fig. 2, the projections h on the hubthereof are at the tops or highest portion of the cam faces g on the colar G, with the result that these two parts act upon the bolt f to causeit to draw together the two halvesof the slotted end portion of the toolpost vE, thereby makin it grip and rigidly hold the spindle F wit the"tool f. As a consequence, said tool cannot turn during the downwardstroke of the ram C.

Toward the end of the upward movement of the ram, the arm H firststrikes the latch bolt and moves it longitudinally against the action ofthe-spring is as above do I scribed, and then engages the overhanging 6part of, the structure K, so that it is moved to bring its projections71, opposite the low portions of the cam'faces g and therebypermits thetwo halves of the lower end of the tool post E to spring apartthusreleas- 6 the tool spindle F. The subsequent partial turning of themaster gear M then gives a partial revolution to the tool and itsspindle, which is' immediately thereafter again clamped to the tool postby the engagement of the arm H with the end of the latch bolt 7 73 atthe beginning of the downward stroke of the ram. The partial turning ofthe master gear with. the blank thus brings successive uncut portions ofsaid blank under the tool and. the above described series of operationsis repeated until one complete revolution of the work table has beenmade. This latter is then fed toward the tool so as to permit the teethof the cutter f to more deeply engage with the teeth of the master ggear:-the operation being repeated, after 7 each revolution of said gear.until finally teeth are cut in the blank in exact correspondence withthose of the master gear M.

As is customary in some forms of slotting 35 machines, the ram C has arodc pivoted to its upper portion and frictionally engaging a bearing ina standard 0 which is fixed to the head B of the slotter. In addition,the tool-carrying portion of the ram is pivoted to the main part thereofso that it is turned on its pivot throughout its upward stroke intosucha position that the cutting tool will clear the work operated on.Immediately upon the beginnin of the downward stroke this pivoted hea isrestored to its normal position in which it remains during the remainderof the out. In Figs. 8 and 9 I have illustrated a modified form of myinvention, in which in place of a master gear or form mountedconcentrically with the blank to be cut or otherwise carried on therotary work table, I have provided a guide'form R mounted on a spindle Fconcentric with the cuttin tool '7. The arrangement is such that t isguide form It at all times remains in engagement -with the partially cutteeth of the blank or at least is in such engagement while the cut,-ting tool does not engage the blank. The construction of said guide formis such that its tooth shaped projections .r transmit movement from therotary work supporting table to the toothed spindle and tool when thislatter is out of engagement with the blank, so that, as before, the toolis free to be turned while it is at the upper end of its stroke out ofengagement with the blank, and is immediately thereafter rigidly clampedbefore it begins its out. It will be understood that the tooth shapedprojections '1' are so shaped and of such dimensions as to transmit theproper amount of movement to the tool and thereby cause it to properlycut teeth of the desired character and dimensions on the blank. I claim:

1. A cutting machine consisting of a table for the support of a blank, amaster form, a tool head, and a cutting tool for operating on the blankcarried by said table, with tary work table for supporting a blank, amaster fornnand a reciprocable slotting head having a cutting toolplaced to be guided by the master form and arranged to alternatelyengage said form and the blank.

4. A cutting machine consisting of a work table for supporting a blankand having a master form mounted on it, areciprocable slotting headhaving a cutting-tool'arranged to alternately engage the master form andthe blank, with means capable of permitting rotation of the tool whileit is engaged with the master form, and preventing such rotation whileit is operating on the blank.

ing a reci'procable head, a multiple point tool carried thereon, meansfor automatically clamping and releasing said tool to prevent itsrotation at certain-parts of its stroke and to permit it at others, witha work table for carrying a blank, and a master form meshing with thepoints of the tool. 6. The combination in a cutting machine of a tablefor supporting a blank to be cut, a master form having means forsupporting it concentrically with the blank, a reciprocable head, a toolspindle movably mounted thereon, a tool on said spindle capable of beingguided by the master form, and

means for periodically clamping said tool" spiudle to prevent. movementof the tool, the same including an arm on the reciprocable head and aprojection on the fixed portion of the machine placed toperiodically-engage said arm.

7. The combination in a cutting machine of a work table for supporting ablank, a master form, a reciprocable head having a tubular tool post,arevolublc spindle in said.

5. The combination with a machine hay-- tool post having a cutting toolcapable of being guided from the master form, means for clamping thetool post to the tool spindle,-

the same including a bolt, a cam structure thereon,- an arm having aportion co-aoting with the cam structure, and a projection mounted onthe frame of. the machine so as to periodically engage the arm tooperate the cam.

8. The combination in a cutting machine of a'work supporting tablehaving a master form, a reciprocable head having a cutting tool arrangedto co-aet with, said form, means forperiodically clamping and releasingsaid-tool to permit'ot its movement, the

same including a cam structure, an arm co-;

operating with the cam structure to operate the clamping means, and adevice mounted upon the frame of the machine so as to cooperate withsaid arm, said device having a spring pressed latch arranged to causeturning of the arm when the latter is moved in one' direction andcapable of yielding without causing turning of the arm when the latteris moved in an opposite direction.

9. The combination in a gear cutting machine of a rotary work supportingtable having means for holding a blank, a master gear mounted on thetable concentric With the blank, a reciprocable head having fixed to ita tubular tool post, a spindle revolubly mounted in said tool post, andhaving a gear shaped cutting tool at its lower end capable of meshingwith the teeth of the master ear, the lower end of the tool post beingslotted and having a transverse bolt, a cam structure and an arm mountedon said bolt, said arm having portions cooperating with said camstructure, with a device mounted upon the frame of the machine forperiodically engaging and turning said arm to cooperate with the cam.

In testimony whereof, I have signed my name to this specification, inthe presence of two subscribingwitnesses.

THOMAS C. DILL.

\Vitnesses:

/VILLIAM E. BRADLEY, Jos. H. KmnN.

